Use heap allocated buffer for rpc::ExecFile::execute_object() and increase size to 128Kb.

src/rpc/exec_file.cc

@@ -1,5 +1,7 @@
 #include "config.h"
 
+#include <memory>
+
 #include "rpc/exec_file.h"
 
 // #include <cassert>
@@ -81,8 +83,9 @@ ExecFile::execute_object(const torrent::Object& rawArgs, int flags) {
   char*  argsBuffer[max_args];
   char** argsCurrent = argsBuffer;
 
-  // Size of value strings are less than 24.
-  char   valueBuffer[buffer_size+1];
+  // On the heap: a buffer of buffer_size does not belong on the stack of whichever thread runs the command.
+  auto   valueStorage = std::make_unique<char[]>(buffer_size + 1);
+  char*  valueBuffer  = valueStorage.get();
   char*  valueCurrent = valueBuffer;
 
   if (rawArgs.is_list()) {

src/rpc/exec_file.h

@@ -10,7 +10,7 @@ namespace rpc {
 class ExecFile {
 public:
   static constexpr unsigned int max_args    = 128;
-  static constexpr unsigned int buffer_size = 4096;
+  static constexpr unsigned int buffer_size = 128 * 1024;
 
   static constexpr int flag_expand_tilde = 0x1;
   static constexpr int flag_throw        = 0x2;